>Actually, VFP has a number of Window handles associated with it. As Vlad mentioned the _VFP.hWnd refers to the frame and _SCREEN.hWnd refers to the desktop (the area the command window generally lives in). Similarly the .Top, .Left, etc. properties of these refer to these individual windows.
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>One thing of note, however. As with 6.0, SDI forms are different from other VFP windows. With a non-SDI form the hWnd property refers to both the frame and client area. In an SDI form, it refers to the frame. The client area is a separate window.

Yes. Using SPY++, I have noticed that VFP has "many (levels of) windows"; I needed a recursive VFP "child" window tree navigator in order to find the handle of a given child window in 6.0.

The main point, I guess, was that code that worked in VFP6 can break in VFP7. First case I'm aware of; sort of like _CUROBJ and FPW.

But performing real-time 3D graphics on a VFP Form or in _SCREEN using a 3rd-party graphics engine isn't typical either :)